public class Exercise6
{
  public static void main(String[] args)
  {
    // test calls here
  }

  public static int minimumPosition1(int[] a)
  {
    int m = 0;
    int n = a.length;
    for (int i = 0; i < n; i++)
    {
      if (a[i] < a[m]) m = i;
    }
    return m;
  }

  public static int minimumPosition2(int[] a)
  {
    if (a == null) return -1;
    int m = 0;
    int n = a.length;
    for (int i = 0; i < n; i++)
    {
      if (a[i] < a[m]) m = i;
    }
    return m;
  }

  public static int minimumElement(int[] a)
  {
    int m = 0;
    int n = a.length;
    for (int i = 0; i < n; i++)
    {
      if (a[i] < m) m = a[i];
    }
    return m;
  }

  public static int[] cut(int[] a, int p, int n)
  {
    int m = a.length;
    int[] b = new int[m-n];
    for (int i = 0; i < p; i++)
      b[i] = a[i];
    for (int i = p+n; i < m; i++)
      b[i-n] = a[i];
    return b;
  }

  public static void replace(char[] a, char x, char y)
  {
    int n = a.length;
    for (int i = 0; i < n; i++)
    {
      if (a[i] == x) a[i] = y;
    }
  }

  public static boolean subtract1(int[] a, int[] b)
  {
    int n = a.length;
    boolean truncated = false;
    for (int i = 0; i < n; i++)
    {
      if (a[i] >= b[i])
        a[i] = a[i]-b[i];
      else
      {
        a[i] = 0;
        truncated = true;
      }
    }
    return truncated;
  }

  public static class Truncated extends Exception 
  { 
    public final int pos;
    public Truncated(int pos) { this.pos = pos; }
  }

  public static void subtract2(int[] a, int[] b) throws Truncated
  {
    int n = a.length;
    for (int i = 0; i < n; i++)
    {
      if (a[i] < b[i]) throw new Truncated(i);
      a[i] = a[i]-b[i];
    }
  }
}